// Build a switch block statement
public static void BuildSwitchBlock(IronyParser parser, Root root, Expression parentExpression, ParseTreeNode currentNode)
{
var s = new SwitchBlock(parentExpression, currentNode.Token.Convert());
parentExpression.ChildExpressions.Add(s);
// Get the expression being tested
parser.ConsumeParseTree(root, s.Variable, currentNode.ChildNodes[1]);
// Build each case block
if(currentNode.ChildNodes[2].ChildNodes.Count > 0)
foreach(var node in currentNode.ChildNodes[2].ChildNodes[0].ChildNodes)
BuildCaseBlock(parser, root, s, node);
}
// Generate a series of codedom if statements representing a switch block.
// (Codedom doesn't support switch)
public static CodeStatement Emit(SwitchBlock switchBlock)
{
// Create the expression for whatever we're switching on.
var codeVar = CodeDomEmitter.EmitCodeExpression(switchBlock.Variable.ChildExpressions[0]);
// Store the first and previous if statements here, since it's needed on future loops.
CodeConditionStatement codeIf = null;
CodeConditionStatement lastIf = null;
foreach(var e in switchBlock.ChildExpressions)
{
// Get the value being compared to: the right operand.
var right = CodeDomEmitter.EmitCodeExpression((e as CaseBlock).Variable.ChildExpressions[0]);
// Create the next if statement.
var nestedIf = new CodeConditionStatement();
// Each case block will compare codeVar (left) to the right operand.
nestedIf.Condition = new CodeBinaryOperatorExpression(codeVar, CodeBinaryOperatorType.ValueEquality, right);
nestedIf.TrueStatements.Add(new CodeCommentStatement("If condition is true, execute these statements."));
foreach (var s in e.ChildExpressions)
nestedIf.TrueStatements.Add(CodeDomEmitter.EmitCodeStatement(s));
nestedIf.FalseStatements.Add(new CodeCommentStatement("If condition is false, execute these statements."));
// if codeIf is null, this is the first if statement.
if (codeIf == null)
{
codeIf = nestedIf;
}
else // It's not the first if statement, so attach it to the previous one.
{
lastIf.FalseStatements.Add(nestedIf);
}
// Store the last if block for the next iteration.
lastIf = nestedIf;
}
return codeIf;
}